Climate twins of South Jacksonville, IL
These are the US cities whose 12-month climate pattern most closely matches South Jacksonville's. Each "twin" must be at least 140 miles away to avoid trivial near-neighbor matches. Similarity is computed across all 24 monthly metrics (12 average temperatures + 12 average precipitations), normalized so temperature and precipitation contribute equally.
Side-by-side: South Jacksonville vs its climate twin
Top match: Urbana, IL
| Month | South Jacksonville | Urbana | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 35.3°F | 17.6°F | 2.21 in | 33.5°F | 17.9°F | 2.31 in |
| February | 40.5°F | 20.9°F | 2.02 in | 38.4°F | 21.2°F | 2.18 in |
| March | 52.1°F | 30.3°F | 3.04 in | 50.4°F | 31.2°F | 2.77 in |
| April | 65.0°F | 40.5°F | 4.46 in | 63.1°F | 41.6°F | 3.94 in |
| May | 75.0°F | 52.6°F | 5.09 in | 73.8°F | 52.7°F | 4.78 in |
| June | 83.4°F | 61.9°F | 4.96 in | 82.7°F | 62.1°F | 4.58 in |
| July | 86.9°F | 65.4°F | 3.97 in | 85.2°F | 65.2°F | 4.49 in |
| August | 85.7°F | 63.2°F | 3.32 in | 84.0°F | 63.6°F | 3.54 in |
| September | 79.9°F | 54.7°F | 3.78 in | 78.8°F | 55.6°F | 3.37 in |
| October | 67.0°F | 42.9°F | 3.11 in | 65.8°F | 43.9°F | 3.35 in |
| November | 52.3°F | 31.8°F | 3.08 in | 50.7°F | 32.2°F | 3.21 in |
| December | 39.9°F | 22.9°F | 2.35 in | 38.5°F | 23.6°F | 2.40 in |
How this is computed
Each city is represented by a 24-dimensional vector: 12 monthly average temperatures and 12 monthly average precipitations. Each dimension is z-score normalized across the population of US cities, so that temperature variance and precipitation variance contribute proportionally. Distance between cities is Euclidean. We filter out cities within 2° latitude/longitude (~140 miles) so that "twins" mean climatically similar but geographically distinct — not just the neighboring town. Full methodology →